Echinocactus horizonthalonius var. nicholii L.D.Benson
, Cacti Ariz. ed. 3. 23 (1969).
External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:87440-2
- Publication
- Cacti of Arizona, The
- Collation
- ed. 3. 23
- Family as entered in IPNI
- Cactaceae
Type Information
- Distribution Of Types
- Arizona (Southwestern U.S.A., Northern America)